No serious commentator doubts that cannabis is potentially damaging to the user. Like tobacco, it is typically smoked and thus shares the potential for lung disease. Like alcohol, it affects reaction times and may raise the risk of road accidents. Cannabis has also been associated with cognitive impairment, deterioration in education performance (van Ours and Williams 2008), and psychotic illness (Arsenault 2004). Moreover, cannabis is often – albeit contentiously – seen as a causal gateway to more serious drug use (Kandel 2002). The question is what to do about it?

Within the last decade the hitherto little known psychoactive substance of khat has emerged as a regional and international issue. In the Horn of Africa khat production has spurred an economic boom, but dramatic increases in consumption have raised public health concerns. Given the complexity of the topic spanning multiple academic disciplines and fields of professional practice, the need for a systematic overview is urgent.

Despite cannabis being the most widely used illegal drug, and therefore the mainstay of the ‘war on drugs’, it has only ever held a relatively marginal position in international drug policy discussions. Amanda Fielding of the Beckley Foundation decided to convene a team of the world’s leading drug policy analysts to prepare an overview of the latest scientific evidence surrounding cannabis and the policies that control its use. The report of the Beckley Foundation's Global Cannabis Commission is aimed at bringing cannabis to the attention of policymakers and guide decision making.

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